Yes, 21 million bitcoins divided by 8 billion people equals 262,500 satoshis for each person. Here the millionaire billionaires own 30% and the remaining 70 percent is with you and all the small and big investors. Now if the whole world is aware of Bitcoin and ready to invest then the price of Bitcoin will be such that millionaires and billionaires will not be able to buy a single Bitcoin even if they want to. So imagine what the price of bitcoin would be if billionaires and millionaires couldn't afford to buy a bitcoin.
The amount of 21 million Bitcoins will not be fully owned, because there are many Bitcoin wallets that are not moving and can never be opened again because the owner died or simply forgot or lost their seed phrase. such as losing a hard disk with a lot of bitcoins and other accidents. so the total circulation of bitcoins will not be fully 21 million. this will make bitcoins increasingly scarce if more people buy bitcoins. billionaires or millionaires will buy as much as they can and hold long term, the price goes up and it will be crazier than the current price.